From Wikipedia
"The central tradition of Yorkshire Day is the reading of the Yorkshire Declaration of Integrity, which affirms Yorkshire's ancient foundation in 875 AD (as the Kingdom of Jorvik by the Viking chief Halfdan Ragnarsson) and asserts the inviolability of its ancient boundaries:
" I, [Name], being a resident of the [West/North/East] Riding of Yorkshire [or City of York] declare:
That Yorkshire is three Ridings and the City of York, with these Boundaries of [Current Year minus 875] years standing; That the address of all places in these Ridings is Yorkshire; That all persons born therein or resident therein and loyal to the Ridings are Yorkshiremen and women; That any person or corporate body which deliberately ignores or denies the aforementioned shall forfeit all claim to Yorkshire status.
These declarations made this Yorkshire Day [Year]. God Save the Queen! " "
I was born and bred in the West Riding, and would never say South Yorkshire (no such place). I'm a tyke through and through.